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Homework Help: AP CHem, finding concentration of H2O2 by titration

  1. Oct 13, 2012 #1
    1. The problem statement, all variables and given/known data

    I need to find the concentration of the H2O2 that we used

    2. Relevant equations
    2KMnO4 + 5H2O2 + 3H2SO4 → 2MnSO4 + 5O2 + 8 H2O + K2SO4 (not sure if correct)

    we got an average of 34.5 ml of titrant, for solution we were adding the titrant to being 5ml of Hydrogen peroxide, and 65 ml of H2SO4

    .6 m H2SO4
    .050 M KMnO4
    ? M H2O2 (what I am trying to find)

    3. The attempt at a solution

    .8625 (very high % error, supposed to be .03 If i did it correctly [3 grams per 100ml in a water based solution is .03 right?])

    I would like to know what I did wrong, and how i could fix it.

    thank you in advance!
  2. jcsd
  3. Oct 13, 2012 #2


    User Avatar

    Staff: Mentor

    From the information given 0.8626 M is a correct answer.

    Convert M to %, THEN calculate the error.
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